Sign insert



FIG. 1 is a front elevational view of the sign insert showing my new design;

FIG. 2 is a rear elevational view of the sign insert showing my new design;

FIG. 3 is a right side elevational view of the sign insert showing my new design;

FIG. 4 is a left side view elevational of the sign insert showing my new design;

FIG. 5 is a top plan view of the sign insert showing my new design; and,

FIG. 6 is a bottom plan view of the sign insert showing my new design; and,

FIG. 7 is a front elevational view of the sign insert showing my new design. 

The ornamental design for a sign insert, as shown and described. 